In the US you sometimes hear that phones in class are necessary to see if your kids are OK in a school shooting scenario.
I think this isn’t a good argument, since school shootings are rare, and it’s unclear if each student having a phone would do more harm than good in that kind of situation.
I’m generally against the idea of planting as many trees as possible.
Trees are not very good carbon sinks because they decompose and burn. Also, there are also some ecological communities where adding trees makes the land a worse carbon sink.
Avoiding cutting down forests to build suburbs is something I can certainly get behind though.